Lunski's Clutter

Given an integer array nums, return an array answer such that answer[i] is equal to the product of all the elements of nums except nums[i].

The product of any prefix or suffix of nums is guaranteed to fit in a 32-bit integer.

You must write an algorithm that runs in O(n) time and without using the division operation.

Example 1:

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Input: nums = [1,2,3,4]
Output: [24,12,8,6]

Example 2:

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Input: nums = [-1,1,0,-3,3]
Output: [0,0,9,0,0]

Given a binary search tree (BST), find the lowest common ancestor (LCA) of two given nodes in the BST.

According to the definition of LCA on Wikipedia: “The lowest common ancestor is defined between two nodes p and q as the lowest node in T that has both p and q as descendants (where we allow a node to be a descendant of itself).”

Example 1:

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Input: root = [6,2,8,0,4,7,9,null,null,3,5], p = 2, q = 8
Output: 6
Explanation: The LCA of nodes 2 and 8 is 6.

Example 2:

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Input: root = [6,2,8,0,4,7,9,null,null,3,5], p = 2, q = 4
Output: 2
Explanation: The LCA of nodes 2 and 4 is 2, since a node can be a descendant of itself according to the LCA definition.

Example 3:

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Input: root = [2,1], p = 2, q = 1
Output: 2

Given the root of a binary search tree, and an integer k, return the kth (1-indexed) smallest element in the tree.

Example 1:

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Input: root = [3,1,4,null,2], k = 1
Output: 1

Example 2:

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Input: root = [5,3,6,2,4,null,null,1], k = 3
Output: 3

Given the root of a binary tree, invert the tree, and return its root.

Example 1:

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Input: root = [4,2,7,1,3,6,9]
Output: [4,7,2,9,6,3,1]

Example 2:

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Input: root = [2,1,3]
Output: [2,3,1]

Example 3:

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Input: root = []
Output: []

Given an array of integers, find if the array contains any duplicates.

Your function should return true if any value appears at least twice in the array, and it should return false if every element is distinct.

Example 1:

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Input: [1,2,3,1]
Output: true

Example 2:

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Input: [1,2,3,4]
Output: false

Example 3:

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Input: [1,1,1,3,3,4,3,2,4,2]
Output: true